<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script src="./js/5-offset.js"></script>
<style>
div { padding: 40px 50px; }
#div1 { background: yellow; }
#div2 { background: blue; }
#div3 { background: red; }
</style>
</head>
<body>

<div id="div1">
	<div id="div2">
		<div id="div3"></div>
	</div>
</div>
</body>
</html>
